Why Two Kundli Sites Give You Different Charts

The ayanamsha setting

Vedic astrology uses the sidereal zodiac, which is fixed to the constellations, while Western astrology uses the tropical one tied to the equinox. The gap between them is the ayanamsha, currently around 24 degrees, and it is the subject of the Sidereal Correction.

What trips people up is that there is more than one ayanamsha. Lahiri, also called Chitrapaksha, is the Indian government standard used in the Rashtriya Panchang and in most Indian software. KP uses its own value a few arcminutes away from Lahiri. Raman sits close to a degree away. Some Western sidereal software uses Fagan-Bradley, which is further off again.

Here is the part worth understanding: a difference of a degree changes nothing for most placements. A planet at 14 degrees of Leo is still comfortably in Leo whichever of these you pick. It only bites when something sits near a sign boundary, and then it flips that planet into the neighbouring sign and can change everything downstream from it. So two sites can agree on eleven placements and disagree loudly on the twelfth, and both are internally consistent.

The house system

This one causes more confusion than the ayanamsha, because the planets do not move at all and yet the chart reads differently.

Most Indian software uses whole-sign houses, where the sign containing the ascendant is the entire 1st house, the next sign is the entire 2nd, and so on. It is clean, and it is the classical default. Other systems, including Placidus, which KP astrology uses, and Sripati, divide the houses by unequal spans that depend on your latitude and the time of day.

Under whole sign, a planet at 28 degrees of your ascendant sign is in the 1st house. Under Placidus it may well be in the 2nd. Same longitude, same ayanamsha, different house, and therefore a different reading of what that planet governs in your life. If two sites give you identical planetary degrees but different house numbers, this is almost always why.

Birth time and time zone

The ascendant moves one degree every four minutes, so a time rounded to the nearest five or ten minutes will produce small differences everywhere, and larger ones in the divisional charts. The Navamsa ascendant changes about every 13 minutes, so two sites given times ten minutes apart can hand you different D9 charts from what you thought were the same details.

Time zone handling is the bigger and more embarrassing one. A site that assumes the wrong offset shifts your whole chart by hours. For Indian births the standard offset is UTC+5:30, but historical cases are where this goes wrong: India ran altered clocks during the Second World War, and if you were born in the early 1940s it is worth checking what your chart software assumed. Births near a time zone change, or in places whose zone has been redefined, run into the same problem.

Coordinates matter less than people fear but are not nothing. Most sites resolve a city name to a single point, and a large city can span enough distance to move the ascendant by a fraction of a degree. That will not change your sign, but it can change a D60.

So which chart is right

Usually none of them is wrong. They are answering with different settings, and most sites do not tell you what those settings were.

What I would actually do. Find the ayanamsha and house system each site used, which is normally in a settings panel or the small print under the chart. If both used Lahiri and whole sign and still disagree, the cause is the birth time or the time zone, so check those next. If they used different ayanamshas, look at whether the disputed planet is near a sign boundary, because if it is, that is your whole explanation.

For picking one going forward, Lahiri with whole-sign houses is the mainstream Indian standard and the one most classical material assumes, so it is a sensible default unless you are specifically working in the KP system, which has its own consistent set of rules. The thing to avoid is mixing: reading a Lahiri chart against KP rules, or comparing a whole-sign house placement against a Placidus one, will produce contradictions that are entirely artificial.

And if the disagreement is in your dasha dates rather than your placements, go back to the birth time. That is nearly always the culprit, because the timeline is calculated from the Moon's exact position and an hour of difference moves it by months.